eichardson



J. n.nicnanns-ON., or'on'icaeo, ILnIN'oi's.

Lettere Patent No. 77,530, dated May 5, 1868.

IMPROVEMENT SCREW-CUTTING MACHINE.

@te .rlgeomle rifa-nh tu in tigen @aan 'zitmt mit melting :part at tlgetime.

TO ALL WHOM IT MAY CONGERN:

Be it known that I, J. H. RICHARDSON, of Chicago, in the county of Cook,inthe State of Illinoisfhave invented an Improved Screw-Cutting Machine;and Ido hereby declare that the following is 'a full and exactdescription thereof, reference being. had to theaccompanying drawings',andto the letters of reference marked thereon, making apart of thisspecification, in,which- Y l Figure 1 is an elevation of my invention.

Figure.2a sectional elevation of the die-head, taken on the line X X,iig. 1^.

Figure 3, a face view of the cam which closes the dies.-

Figure 4, n. sectional Aelevation of the die-head, taken on the line ZZ, g. I.

Figure 5, a face'view of the collar, which governs the position of thedies.

Figure@ represents one of the dies.

The nature of my invention consists in combining,'with the cams of a.die-head, a slotted collar, in which operates a stop, by meanso` whichthe .dies may be set .to cut screws of di'erent sizes, and to open and`shut uniformly by reversing thev motion ot' rthe drive-pulley; and inthe use of a friction-band passing over the diehead, for checking itsmotion, while the cams open the diesvzind loosen the' screw.

In order to give a correct understanding of my invention, I have markedcorresponding parts with similarletters, and will now give aldetaileddescription, which will enableothers skilled in the art to make and useit.

A A represent a substantial iron frame, which supports a drive-pulley,B, one of itsjournals-being made long enough to fasten to the neck I ofthe head by means of a. screw-thread in the-usual manner. This necky Iis inade of iron, finished in a lathe, and is rigidly attached to thatpart of the head shown at U, figs. I and 2,

'which has grooves, a, sunk Ain its face, of suchv depth aswill'correspond vwith the thickness ofthe dies W, gs. I

2 and 6, said part U'being secured to a face-plate, C, and projectingoutward from the same the thickness of the dies, and Working'insideJofthe cams m, fig. 2, made in that part of thehead shown at D. o

E representsa part of the head larranged to tron the neck I, and isfastened to lthe part D bymeansA of screws, and has grooved cams n madein its face, in which lugs o, figs. 2 and 6, made on the dies W,operate. The faces ofthe partsE D fitting each other, place the cams mand nin the proper position.

A pulley, F, is rigidly attached to-the part,E, 'and has a groove in itsperiphery for a friction-band, G, to work in, and has a pin or stop, P,iig. 4, projecting outward from itsvacc to correspond 'with the depth ofa slot, J', in the collar'II, figs. 1 and 5, in which said pin operates.llhis collar'is-anlimpcrtant feature in my invention, and is arranged toturn on the neck I, the length oi' slot J, and has a thumb-screw, S, putthrough it for holding it in position on said neck. I

A metal band, G, is securedv to the saine bed-piece as the frame A, atthc'oppositc side ot' the machine to that which a treadle, Y,is-attached, for tightening said band, and checking the motion ofthepulley over which it passes, and thus allow the dies to open and loose-nthe screw.

Operation. The dies w canA be moved inward by turning the drive-pulleyin the direction indicated by the dart 2,

fig. 1, at the same time holding the plilley Fstati'onary by the band Grand treadlc Y, after which lthe screw S should be loosened andthe'collar I-I`turned, so as to bring vthe stop P, 4, against the end,3, of the slot J', fig. 5, which willhold said dies in position forcutting-.screws ci' nnifornrsizes, but permit the'dies to open andloosen the screw, when cut, by reversing the motion of pulley Band'checkingthe motion of pulley F, ,as before, the stop I working backand forth in the slot J. I

Having thus described my invention, I claim- The combination of neck I,face-plate C, cams m n, pulley F, friction-baud G, collar H, treadleY,'dies W, and die-head D E U, the whole being constructed and arrangedto operate substantially as herein specied.

- J. H. RICHARDSON.

Witnesses z' GEORGE RIoHAnDsoN,

G. F. OHAPINL

